In how many days approx. do the first sypmtoms of pregnancy occur after intercourse ?

Pregnancy symptoms: Ovulation usually happens day 13-14 from the beginning of the last period. If a woman has unprotected intercourse around ovulation then implantation can occur 6-7 days later. After the embryo implants - day 21-25, then the woman can start experiencing various symptoms, however there are women who experience no symptoms of pregnancy until their belly actually start showing.